Short answer: because I don't want my character automatically put in the miniskirts that SE decided are standard female AF gear for most of the jobs I play. Whether it happens on my screen or not.
I pick outfits with longer skirts or pants. I don't want that changed back into the outfit I specifically don't want to wear, because someone doesn't like an entirely different group of people's outfits.
And no, targeted turning-off of certain outfits is not the solution. Less likely for me to be personally affected, more theoretical chance for it to be abused in another context.